US4721893A - Process and apparatus for controlling the electric motor drive of a unit for the manufacture of moldings from multi-component plastics - Google Patents
Process and apparatus for controlling the electric motor drive of a unit for the manufacture of moldings from multi-component plastics Download PDFInfo
- Publication number
- US4721893A US4721893A US06/745,088 US74508885A US4721893A US 4721893 A US4721893 A US 4721893A US 74508885 A US74508885 A US 74508885A US 4721893 A US4721893 A US 4721893A
- Authority
- US
- United States
- Prior art keywords
- carousel
- molds
- electric motor
- conveyor belt
- speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C39/04—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles using movable moulds not applied
- B29C39/06—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles using movable moulds not applied continuously movable, e.g. along a production line
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/22—Component parts, details or accessories; Auxiliary operations
- B29C39/44—Measuring, controlling or regulating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S388/00—Electricity: motor control systems
- Y10S388/923—Specific feedback condition or device
- Y10S388/93—Load or torque
Definitions
- controllable drives in particular controllable electric motors
- the drives being controlled by limit switches on the periphery of the conveyor belt or carousel.
- one only adjustable switch cam is provided, which successively actuates two limit switches, of which the first, in the direction of movement, reduces the speed and the second stops the movement of the conveyor belt or carousel when the mold is in the desired position.
- the signals provided by the limit switches are compared, in a speed controller, with predetermined intended values, so as to control the electric motor drive.
- Further circuit elements are provided for the fixed devices for filling, demolding and cleaning of the molds, and trigger the requisite functions for the process sequence.
- the comparison parameter in both cases is a signal voltage generated via the electric motor drive. This is compared, on the one hand, with an electrical voltage, to the pattern of which a speed profile is allotted, and, on the other hand, is converted into electric pulses which are summed in their time sequence as a function of the movement steps of the conveyor belt or carousel and compared with a predetermined, variable master function.
- the periphery of the conveyor belt or carousel is divided into increments corresponding to the number of pulses per revolution.
- Each movement step is defined by a particular pulse number, so that the function required for the sequence of production of the molding can be freely allotted to any desired position of the molds; in this allotment of the movement steps, the devices having a fixed position relative to the conveyor belt or carousel--for filling, demolding and cleaning of the molds--are also involved.
- the devices having a fixed position relative to the conveyor belt or carousel--for filling, demolding and cleaning of the molds--are also involved.
- the apparatus for carrying out the process consists of a tachogenerator connected to a controllable electric motor, the signal voltage of the tachogenerator being passed to the actual-value input of a speed controller with a signal corresponding to the position of the molds being applied to the intended value input of the speed controller, the tachogenerator being coupled to a pulse generator, the pulses of which can be adjusted by means of a comparator circuit, with a preprogrammed pulse number, generated by a control system of the unit, for providing the signal applied to the intended value input of the speed controller.
- the apparatus according to the invention operates with great accuracy and is made up of simple, commercially available components. No longer are limit switches and switch cams required for controlling the intermittent movement of the conveyor belt or carousel. Control errors are impossible since the pulse generator is actuated directly by the tachogenerator driven by the electric motor.
- 1 is the rotatable carousel on which are fixed a plurality of molds 2. Fixed devices for filling, 3, demolding, 4, and cleaning (not shown) of the molds are provided at a distance from the carousel. A device for applying release agent is marked 5.
- the carousel 11 is caused to rotate by an electric motor drive. This consists of an electric motor 7 which drives a sprocket 8. A drive chain passes over the sprocket 8 and two guide wheels 9 and engages, between the guide wheels, with a toothed crown attached to the carousel.
- the carousel 1 is moved intermittently, so that each mold 2 can be stopped in a precisely defined position relative to the devices 3, 4 and 5. In other words, the movement of the carousel takes place, within one revolution, in the number of steps corresponding to the number of molds.
- the electric motor 7 is provided with appropriate controls for this purpose. These consist of a tachogenerator connected to the electric motor and driveable by the latter.
- the tachogenerator 10 produces a signal voltage which can be varied in accordance with the rotary movement of the electric motor, and which is, on the one hand, fed to the actal-value input 12 of a speed regulator 11 and, on the other hand, controls, as a function of its time variation, a pulse generator 14.
- a particular, freely selectable pulse number is allotted to each movement step of the carousel.
- the pulses, triggered at 14, are summed in their sequence and compared, by means of a comparator circuit 15, with a pulse number preprogrammed in a control system 16 for the unit.
- the comparator circuit 15 used can be, for example, a circuit which is capable of summing incoming pulses of a pulse generator and comparing this sum with a value predetermined by the control system 16 of the unit, with a signal being released if they are the same.
- the signal resulting from this comparison is passed to the intended-value input 13 of the speed regulator 11, which is connected to a motor control system 17 for the electric motor 7.
- the carousel is controlled in predetermined steps via the speed controller and the motor control system, as a function of the intended/actual value comparison of the pulses. Because of the high inertia of the system, the carousel movements can also be carried out at two speed levels, namely running speed and crawl speed immediately before coming to the end of a movement step. Each switch-over to crawl speed is determined by a freely selectable pulse number and also results from the comparison with the master function predetermined in the control system 16 of the unit.
- the comparator circuit 15 can also consist of a processor, a digital position regulator, a pulse counter and a digital-analogue converter.
- the process distance of travel per unit time is calculated from the predetermined distance and corresponding speed, as a function of acceleration and retardation values laid down via the control system 16 of the unit, and is put, as the intended value, into a position regulator following the processor.
- this intended value is compared with the actual position value available from the pulse counter.
- a digital value is then provided at the position regulator output, which, after conversion via the digital-analogue converter, is applied to the subsequent speed controller 11 as an analogue intended value at 13.
- the deviations are ⁇ 1 pulse.
- the pulse generator 14 is re-zeroed after each revolution of the carousel by means of a reference point 6.
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
Claims (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19843422429 DE3422429A1 (en) | 1984-06-16 | 1984-06-16 | METHOD AND DEVICE FOR CONTROLLING THE ELECTROMOTORIC DRIVE OF A PLANT FOR PRODUCING MOLDED PARTS FROM MULTI-COMPONENT PLASTICS |
DE3422429 | 1984-06-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
US4721893A true US4721893A (en) | 1988-01-26 |
Family
ID=6238530
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/745,088 Expired - Fee Related US4721893A (en) | 1984-06-16 | 1985-06-17 | Process and apparatus for controlling the electric motor drive of a unit for the manufacture of moldings from multi-component plastics |
Country Status (5)
Country | Link |
---|---|
US (1) | US4721893A (en) |
EP (1) | EP0168629B1 (en) |
AT (1) | ATE45910T1 (en) |
CA (1) | CA1249705A (en) |
DE (2) | DE3422429A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4904913A (en) * | 1988-07-18 | 1990-02-27 | Power Saving Devices, Inc. | Motor control system for a plastic forming machine |
CN103273618A (en) * | 2013-06-05 | 2013-09-04 | 富强鑫(宁波)机器制造有限公司 | Rotary plate clamp device for multi-component plastic injection molding machine and control mode thereof |
Citations (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3778693A (en) * | 1971-09-06 | 1973-12-11 | Philips Corp | Pulse-to-revolution converter for converting a variable pulse frequency into a proportional rotation speed of a shaft |
US3797808A (en) * | 1970-10-22 | 1974-03-19 | Cincinnati Milacron Inc | Plastication control system for injection molding machines |
US3889169A (en) * | 1973-10-11 | 1975-06-10 | Ibm | Position and velocity servo control for motor controlled article carrier and handler |
US3930774A (en) * | 1973-07-24 | 1976-01-06 | Industrial Nucleonics Corporation | Extruder controller |
US3955130A (en) * | 1974-12-20 | 1976-05-04 | General Electric Company | Motor control circuit including motor current limiting means |
US4008829A (en) * | 1974-08-29 | 1977-02-22 | Cincinnati Milacron, Inc. | Ratio controlled mixing of liquids |
US4075301A (en) * | 1976-01-22 | 1978-02-21 | Owens-Corning Fiberglas Corporation | Method and apparatus for depositing material into a moving receptacle |
US4139811A (en) * | 1976-10-26 | 1979-02-13 | Xerox Corporation | Method and means for increasing the stiffness of limited frequency servo systems |
US4153402A (en) * | 1977-05-02 | 1979-05-08 | Bata Shoe Company, Inc. | Injection apparatus control |
US4171193A (en) * | 1977-01-03 | 1979-10-16 | Reifenhauser Kg | Apparatus for the production of shaped strands of thermoplastic synthetic-resin material |
US4331910A (en) * | 1980-02-04 | 1982-05-25 | Fujitsu Fanuc Limited | Positioning control system |
US4336013A (en) * | 1979-05-16 | 1982-06-22 | Kerr Concrete Pipe Company | Apparatus for forming concrete articles of uniform density |
US4379987A (en) * | 1979-10-09 | 1983-04-12 | Fujitsu Fanuc Limited | Spindle rotation control system |
US4406605A (en) * | 1979-05-16 | 1983-09-27 | Kerr Concrete Pipe Company | Apparatus for forming concrete pipe of uniform density including control means to vary feed rate of concrete/aggregate as function of packerhead torque |
US4437046A (en) * | 1982-06-18 | 1984-03-13 | Crompton & Knowles Corporation | Extrusion drive control system |
US4470937A (en) * | 1981-07-14 | 1984-09-11 | Bridgestone Tire Company, Limited | Size control of extrusion molded articles |
US4476417A (en) * | 1982-08-13 | 1984-10-09 | Siemens Aktiengesellschaft | Control arrangement for a static converter |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1151654B (en) * | 1961-01-10 | 1963-07-18 | Nothelfer & Soehne Werkzeug U | Injection molding machine with automatic molding machines for processing thermoplastics |
JPS5311975B1 (en) * | 1971-02-19 | 1978-04-26 | ||
US3957408A (en) * | 1974-10-07 | 1976-05-18 | Binney & Smith Inc. | Automated molding machine |
US4424015A (en) * | 1981-03-12 | 1984-01-03 | Pemco-Kalamazoo, Inc. | Apparatus for injection molding |
-
1984
- 1984-06-16 DE DE19843422429 patent/DE3422429A1/en not_active Withdrawn
-
1985
- 1985-06-11 AT AT85107180T patent/ATE45910T1/en not_active IP Right Cessation
- 1985-06-11 DE DE8585107180T patent/DE3572620D1/en not_active Expired
- 1985-06-11 EP EP85107180A patent/EP0168629B1/en not_active Expired
- 1985-06-17 US US06/745,088 patent/US4721893A/en not_active Expired - Fee Related
- 1985-06-17 CA CA000484168A patent/CA1249705A/en not_active Expired
Patent Citations (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3797808A (en) * | 1970-10-22 | 1974-03-19 | Cincinnati Milacron Inc | Plastication control system for injection molding machines |
US3778693A (en) * | 1971-09-06 | 1973-12-11 | Philips Corp | Pulse-to-revolution converter for converting a variable pulse frequency into a proportional rotation speed of a shaft |
US3930774A (en) * | 1973-07-24 | 1976-01-06 | Industrial Nucleonics Corporation | Extruder controller |
US3889169A (en) * | 1973-10-11 | 1975-06-10 | Ibm | Position and velocity servo control for motor controlled article carrier and handler |
US4008829A (en) * | 1974-08-29 | 1977-02-22 | Cincinnati Milacron, Inc. | Ratio controlled mixing of liquids |
US3955130A (en) * | 1974-12-20 | 1976-05-04 | General Electric Company | Motor control circuit including motor current limiting means |
US4075301A (en) * | 1976-01-22 | 1978-02-21 | Owens-Corning Fiberglas Corporation | Method and apparatus for depositing material into a moving receptacle |
US4139811A (en) * | 1976-10-26 | 1979-02-13 | Xerox Corporation | Method and means for increasing the stiffness of limited frequency servo systems |
US4171193A (en) * | 1977-01-03 | 1979-10-16 | Reifenhauser Kg | Apparatus for the production of shaped strands of thermoplastic synthetic-resin material |
US4153402A (en) * | 1977-05-02 | 1979-05-08 | Bata Shoe Company, Inc. | Injection apparatus control |
US4336013A (en) * | 1979-05-16 | 1982-06-22 | Kerr Concrete Pipe Company | Apparatus for forming concrete articles of uniform density |
US4406605A (en) * | 1979-05-16 | 1983-09-27 | Kerr Concrete Pipe Company | Apparatus for forming concrete pipe of uniform density including control means to vary feed rate of concrete/aggregate as function of packerhead torque |
US4406605B1 (en) * | 1979-05-16 | 1986-11-04 | ||
US4379987A (en) * | 1979-10-09 | 1983-04-12 | Fujitsu Fanuc Limited | Spindle rotation control system |
US4331910A (en) * | 1980-02-04 | 1982-05-25 | Fujitsu Fanuc Limited | Positioning control system |
US4470937A (en) * | 1981-07-14 | 1984-09-11 | Bridgestone Tire Company, Limited | Size control of extrusion molded articles |
US4437046A (en) * | 1982-06-18 | 1984-03-13 | Crompton & Knowles Corporation | Extrusion drive control system |
US4476417A (en) * | 1982-08-13 | 1984-10-09 | Siemens Aktiengesellschaft | Control arrangement for a static converter |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4904913A (en) * | 1988-07-18 | 1990-02-27 | Power Saving Devices, Inc. | Motor control system for a plastic forming machine |
CN103273618A (en) * | 2013-06-05 | 2013-09-04 | 富强鑫(宁波)机器制造有限公司 | Rotary plate clamp device for multi-component plastic injection molding machine and control mode thereof |
CN103273618B (en) * | 2013-06-05 | 2015-06-10 | 富强鑫(宁波)机器制造有限公司 | Rotary plate clamp device for multi-component plastic injection molding machine and control mode thereof |
Also Published As
Publication number | Publication date |
---|---|
CA1249705A (en) | 1989-02-07 |
DE3572620D1 (en) | 1989-10-05 |
EP0168629B1 (en) | 1989-08-30 |
ATE45910T1 (en) | 1989-09-15 |
EP0168629A2 (en) | 1986-01-22 |
DE3422429A1 (en) | 1985-12-19 |
EP0168629A3 (en) | 1988-03-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
AS | Assignment |
Owner name: ELASTOGRAN MASCHINENBAU GMBH, 8201 STRASSLACH, GER Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:REHMANN, GUENTER;KOENTGES, GERHARD;MACKERT, WERNER;REEL/FRAME:004646/0708 Effective date: 19861203 |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 19960131 |
|
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |